I f you’re like most Americans, you eat too much at all-you-can-eat buffets. With auto insurance, it’s no different. Drivers who are similar in all respects–age, gender, driving record–pay roughly the same premiums whether they drive 5,000 or 50,000 miles per year, even though the likelihood of a collision increases with each mile. This “all-you-can-drive” pricing scheme imposes significant costs on society: more traffic accidents, congestion, air pollution, greenhouse gas emissions, and dependence on oil.